ECAT Chemistry Chapter 23 Aldehydes and Ketones Online Test With Answers

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ECAT Chemistry Chapter 23 Aldehydes and Ketones Online Test

Sr. # Questions Answers Choice
1
2 Which alcohol may be oxidised to a product which react with 2,4-dinitorphenylhydrazine reagent but not with Fehling's reagent Butan-1-ol Butan-2-ol 2-methylpropan-1-ol 2-methylpropan-2-ol
3 What is formed when propanone is refluxed with an anhydrous solution of NaBH4 Propanal Propan-1-ol Propan-2-ol Propane
4 In 1903 Arthur Lapeworth became the first chemist to investigate a reaction mechanism. The reaction he investigated was that of hydrogen cyanide with propanone. What do we now call the mechanism of this reaction Electrophilic addition Electrophilic substitution Nucleophilic addition Nucleophilic substitution
5 Compounds X, Y and Z, all react with PCI5to release hydrogen chloride, but only one of them reacts eith 2,4-dinitrophenylhydrazine reagent. Which one of the following combinations could be X, Y and Z
6 Which reagent could be used to distinguish between CH3CH(OH)CH2CHO and CH3COCH2CH2OH Acidified potassium dichromate Dilute sulphuric acid 2,4-dinitrophenylydrazine Fehling's reagent
7 Br<sub>2(aq)</sub> 2, 4-dinitrophenylhydrazine NaBH Tollen's reagent
8 Which isomer of C5H11OH gives, one dehydration, the greastest number of different alkenes
9 Acetaldehyde is used to make Rubbber Antiseptics Phenolic resin All of these
10 Which reagent will distinguish a ketone from an aldehyde Br<sub>2</sub> 2, 4-dinitrophenylhydrazine NaBH<sub>4</sub> Tollen's reagent
11 During the mechanism of aldol condensation a/an ______ is formed Oxide Alkali Alkoxide ion None of these
12 Which one of the following statement is wrong regarding differences between aldehydes and ketones Aldehydes undergo reduction to form primary alcohols while ketones undergo reduction to form secondary alcohols Aldehydes undergo oxidation to form acids having less number of carbon atoms while ketones undergo oxidation to form acids having same number of carbon atoms Aldehydes give positive silver mirror test while ketones give negative -mirror test Aldehydes can undergo polymerization while ketones cannot undergo polymerizarion
13 Aldol condensation is actually Electrophilic addition of carbonation Electrophilic addition of carbonium ion Nucleophilic addition of carbonation Nuclephilic addition of carbonium ion
14 Aldehydes is distinguished from ketones by using Tollen's reagent Benedict reagent Fehling solution All of the above
15 In aldol condensation reaction, a double bond is formed between ______ and ______ carbon atoms <span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);">α</span>and<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);">β</span> <span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);">α</span>and<span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);">α</span> <span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);">α</span>and Y None of these
16 Silver mirror test is applied for Aldehydes Alcohols Acids Esters
17 Cannizzaro's reaction in not given by Formaldehyde Acetaldehyde Benzaldyhyde Trimethylacetaldehyde
18 The base used in Cannizzaro's reaction is NaOH KOH CHI<sub>3</sub> All of these
19 Acetone reacts with HCN to form a cyanohydrin. It is an example of Electrophilic addition Electrophilic substitution Nucleophilic addition Nucleophilic substitution
20 Ketons are prepared by the oxidation of Primary alcohol Secondary alcohol Tertiary alcohol None of these
21 Formaline Contains ______% alcohol 80 37 8 52
22 Formaldehyde is used to make Plastics Medicine Antiseptic All of these
23 A food chemist wants to create the odour of pineapples for a product. An ester with this odour has the formula C3H7COOC2H5.Which pair of reagents would produce this ester C<sub>2</sub>H<sub>5</sub>CI and C<sub>3</sub>H<sub>7</sub>COOH C<sub>2</sub>H<sub>5</sub>OH and C<sub>3</sub>H<sub>7</sub>CONH<sub>2</sub> C<sub>2</sub>H<sub>5</sub>OH and C<sub>3</sub>H<sub>7</sub>COOH C<sub>3</sub>H<sub>7</sub>OH and C<sub>2</sub>H<sub>5</sub>COCI
24 Which one of the following is a product of the reaction between C6H5CH2OH and CH3COCI C<sub>6</sub>H<sub>5</sub>OCOCH<sub>3</sub> C<sub>6</sub>H<sub>5</sub>CH<sub>2</sub>CI C<sub>6</sub>H<sub>5</sub>CH<sub>2</sub>OCOCH<sub>3</sub> C<sub>6</sub>H<sub>5</sub>CH<sub>2</sub>COCI
25 The color of ppts formed by Fehling's test is Brick red Red Yellow Orange
26 An organic compound has the following properties ; It gives a positive tri-iodomethane test; it gives a yellow ppt, with 2, 4-DNP regent; it does not react with Tollen's reagent . Which compound would give these results CH<sub>3</sub>CHO CH<sub>3</sub>CH<sub>2</sub>OH CH<sub>3</sub>CH<sub>2</sub>COCH<sub>3</sub> CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>CHO
27 The product of the reaction between propanone and HCN is hydrolysed under acidic conditions. What is the formula of the final product CH<sub>3</sub>CH(OH)COOH CH<sub>3</sub>CH<sub>2</sub>CH(OH)COOH (CH<sub>3</sub>)<sub>2</sub>C(OH)COOH CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>COOH
28 Aldehydes which do not haveα-hydrogen undergo Aldol combination Cannizzaro's reaction Substitution Elimination
29 For which one of the following pairs of compounds can the members be distinguished by means of Tollen's test HCHO and CH<sub>3</sub>CHO CH<sub>3</sub>CHO and CH<sub>3</sub>COCH CH<sub>3</sub>COCH<sub>3</sub>and C<sub>6</sub>H<sub>5</sub>COCH<sub>3</sub> CH<sub>3</sub>COOH and CH<sub>3</sub>COOCH<sub>3</sub>
30 On adding sodium nitroprusside ketones give Red Wine red White Orange
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